9998440087 has 2 divisors, whose sum is σ = 9998440088. Its totient is φ = 9998440086.

The previous prime is 9998440073. The next prime is 9998440169. The reversal of 9998440087 is 7800448999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998440087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998440007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999220043 + 4999220044.

It is an arithmetic number, because the mean of its divisors is an integer number (4999220044).

Almost surely, 2^9998440087 is an apocalyptic number.

9998440087 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998440087 is an equidigital number, since it uses as much as digits as its factorization.

9998440087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 9998440087 is about 99992.2001308102. The cubic root of 9998440087 is about 2154.3226598504.

The spelling of 9998440087 in words is "nine billion, nine hundred ninety-eight million, four hundred forty thousand, eighty-seven".